Bricks by Didier Werke. Checkerwork passages straight with very wide spacing.
Repairs Every 12 - 13 months
Temperatures Melting end 1,400°C. Flow end 1,250°C. as indicated by crown thermocouples. The tank was square ended with one canal in each side of the flowing-end wall. The tank appeared to be left very much to its own devices, very little attention being paid to control. There was not even one open sight hole into the tank, either at the filling end or flowing end.
Casting Machines Boudin type; two kinds of rollers were used, namely ordinary cast iron and special heat resisting steel, both supplied by Krupps. Roller dimensions were:
Length: |
1.5 |
m. |
(57") |
Diameter: |
130 |
mm. |
(5") |
Bore: |
90 |
mm. |
(3") |
Tray rollers led from machine to lehr with very slight fall.
Lehrs Gear driven, hand oiling. Length 90 metres. Direct heat top and bottom. The first twelve rollers were asbestos discs on iron core and the first forty rollers were water cooled by means of hairpin pipes. Before the war only one lehr was operated from this tank, but hand ladling was also in use. A second lehr is now nearly completed and will be in operation at an early date. The present ribbon width is 1.3 metres (51") but that from the second lehr will be 1.6 metres (63"). The substance tolerance is 0.1 mm.
Speed of Flow This was given as follows:-
3-4 mm. substance - 2.4 m. per min. (94.5"/min.)
6-7 mm. substance - 1.3 m. per min.
The glass was packed direct at the lehr end by two carriers.
Production was at the rate of 4,000 sq. metres (43,000 sq. ft.) per 24 hours at the time of the visit.
Cutting Normal edge and centre split. The cross cut was done by hand, there being two cutters who also stripped the edges, one at either side of the lehr. The length cut was hand measured on each sheet by lath.
Quality This was exceedingly poor even for Clear Rolled glass.
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